sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function menu() { 
	var obj = document.getElementById("nav");
	var padMenu = document.getElementById("nav");
	trueWidth = document.getElementById('nav').offsetWidth;
	if (trueWidth < 800) {
	padMenu.style.marginLeft = (800 - trueWidth) / 2;
	}
 }